US4751982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foldable ladder
Assignee: Individual
•
Filing: 1987-06-04
•
Granted: 1988-06-21
•
Expires: 2007-06-04
Abstract
Abstract A foldable ladder having a plurality of rigid steps and inwardly folding arms pivotably secured to the steps so as to be rigid in use by capable of being folded for storage.
Inventors
- 👤 Nicholas Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:13
CPC Classifications
E; E06; E06C; E06C9/00; E06C9/06; E06C9/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
191 words
A foldable ladder of the type having a plurality of rigid steps and being operable between an operating position in which said ladder is suspended from an elevated structure and at least the majority of said steps are supported below said structure, and spaced apart from each other in a substantially parallel arrangement, and, respectively, a folded position in which said steps are disposed in close proximity to each other, said ladder comprising a pair of spaced inwardly folding arms at opposite sides of each step in a substantially parallel arrangement, each of said pair of arms being connected by a first rod assembly comprised of a rod and a spacer sleeve rotatable about said rod and spacing a pair of arms, each of said arms being pivoted about said rod assembly, each of said arms being further pivotably connected at each end to adjacent steps by a second rod assembly comprised of a rod and a spacer sleeve rotatable about said rod and spacing a pair of arms, said steps being pivotable on said rods of said second rod assembly, and means for extending said ladder away from said structure.
Claim 2
Dependent Claim
191 words
A foldable ladder of the type having a plurality of rigid steps and being operable between an operating position in which said ladder is suspended from an elevated structure and at least the majority of said steps are supported below said structure, and spaced apart from each other in a substantially parallel arrangement, and, respectively, a folded position in which said steps are disposed in close proximity to each other, said ladder comprising a pair of spaced inwardly folding arms at opposite sides of each step in a substantially parallel arrangement, each of said pair of arms being connected by a first rod assembly comprised of a rod and a spacer sleeve rotatable about said rod and spacing a pair of arms, each of said arms being pivoted about said rod assembly, each of said arms being further pivotably connected at each end to adjacent steps by a second rod assembly comprised of a rod and a spacer sleeve rotatable about said rod and spacing a pair of arms, said steps being pivotable on said rods of said second rod assembly, and means for extending said ladder away from said structure.
Claim 3
Dependent Claim
24 words
The ladder of claim 1 wherein said means extending said ladder away from said structure comprises said rod connecting said arms to the steps.
Claim 4
Dependent Claim
22 words
The ladder of claim 1 wherein each of said arms comprises a pair of unconnected parts pivotally associated about said rod assembly.
Claim 5
Dependent Claim
15 words
The ladder of claim 1 including at least one lubricating washer at each pivotable part.
Claim 6
Dependent Claim
13 words
The ladder of claim 4 wherein said lubricating washer is a TEFLON washer.
Claim 7
Dependent Claim
28 words
The ladder of claim 1 wherein the lower portion of each step is recessed so as to cover said arms when the ladder is in a folded position.
References Cited (Backward Citations)
US1101808A
Cited
US1859984A
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US2575573A
Cited
US3344886A
Cited
US3307654A
Cited
US3677366A
Cited
US4231449A
Cited
US4189030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |